Pretty useless for Kodi because it can't bitstream lossless audio (runs on a closed ecosystem and requires licensing to do so). Also can't handle 23.97 output (converts to 24fps) so there's judder. There are lots of other cheaper devices which can do the job better.

As far as Netflix 4k streaming goes, you need HDMI 2.0/HDCP 2.2 support, and if you have that you almost certainly have Netflix 4k streaming built into your 4k TV already.